Excessive saturation effect of visible light CCD

In the output image of the visible light CCD irradiated by high intensity light, black area appears inside the white saturation scope. In this paper, the phenomenon is called excessive saturation effect of visible light CCD. In the experiment during which excessive saturation effect occurs, there are four basic waveforms. The course of signal processing of the CCD camera system is introduced, in which the correlated double sampling is indispensable for reducing some noise of output signal of CCD. Corresponding to the four basic waveforms, the output results of correlated double sampling(CDS) are given, which bring four basic areas (black area, gray area, saturated white area, excessively saturated black area) in output image of CCD. In waveform corresponding to the excessively saturated b